From 6fc772ce787d924db1f3525cd7dfc72f6b3e12df Mon Sep 17 00:00:00 2001
From: Lucas Scharenbroich <lscharen@prowestgis.com>
Date: Fri, 16 Jul 2021 17:05:29 -0500
Subject: [PATCH] Sorted out BG1 edge artifacts

---
 assets/gba-cloud-bgnd-8-color.png | Bin 0 -> 3843 bytes
 assets/gba-cloud-bgnd.png         | Bin 0 -> 4411 bytes
 assets/smb-2bit-328x208-shift.png | Bin 0 -> 3941 bytes
 assets/smb-2bit-328x208.png       | Bin 0 -> 3968 bytes
 assets/smb-2bit-512x223.png       | Bin 0 -> 6341 bytes
 build-image.bat                   |   3 +-
 package.json                      |   2 +-
 src/Actions.s                     |   9 +-
 src/App.Init.s                    |   6 +-
 src/App.Main.s                    | 117 ++++++++++++--
 src/Render.s                      |   2 +
 src/blitter/BG1.s                 |  49 +++++-
 src/blitter/Blitter.s             |   9 +-
 src/blitter/DirectPage.s          |  18 ++-
 src/blitter/Tiles.s               | 255 +++++++++++++++++-------------
 tools/pngtoiigs.js                |  21 ++-
 16 files changed, 358 insertions(+), 133 deletions(-)
 create mode 100644 assets/gba-cloud-bgnd-8-color.png
 create mode 100644 assets/gba-cloud-bgnd.png
 create mode 100644 assets/smb-2bit-328x208-shift.png
 create mode 100644 assets/smb-2bit-328x208.png
 create mode 100644 assets/smb-2bit-512x223.png

diff --git a/assets/gba-cloud-bgnd-8-color.png b/assets/gba-cloud-bgnd-8-color.png
new file mode 100644
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diff --git a/build-image.bat b/build-image.bat
index f526bd4..be18e14 100644
--- a/build-image.bat
+++ b/build-image.bat
@@ -15,4 +15,5 @@ REM Cadius does not overwrite files, so clear the root folder first
 REM Now copy files and folders as needed
 %CADIUS% ADDFILE %IMAGE% %FOLDER% src\\GTETestApp
 %CADIUS% ADDFILE %IMAGE% %FOLDER% emu\\test.pic
-%CADIUS% ADDFILE %IMAGE% %FOLDER% emu\\bg1.bin
+%CADIUS% ADDFILE %IMAGE% %FOLDER% emu\\bg1a.bin
+%CADIUS% ADDFILE %IMAGE% %FOLDER% emu\\bg1b.bin
diff --git a/package.json b/package.json
index 925551d..f9f67e6 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "debug": "%npm_package_config_crossrunner% src\\GTETestApp -Source src\\GTETestApp_S02_MAINSEG_Output.txt -Debug -CompatibilityLayer",
     "build": "%npm_package_config_merlin32% -V %npm_package_config_macros% src\\App.s",
     "build:watch": "watch \"npm run build\" src",
-    "build:assets": "node ./tools/pngtoiigs.js ./assets/gba-cloud-bgnd-8-color.png ./emu/bg1.bin"
+    "build:assets": "node ./tools/pngtoiigs.js ./assets/smb-2bit-328x208.png ./emu/bg1a.bin && node ./tools/pngtoiigs.js ./assets/smb-2bit-328x208-shift.png ./emu/bg1b.bin"
   },
   "repository": {
     "type": "git",
diff --git a/src/Actions.s b/src/Actions.s
index f27536a..6a40663 100644
--- a/src/Actions.s
+++ b/src/Actions.s
@@ -1,10 +1,12 @@
 MoveLeft
                      clc
                      adc   StartX               ; Increment the virtual X-position
-                     cmp   #164
-                     bcc   *+5
-                     lda   #0
                      jsr   SetBG0XPos
+
+                     lda   StartX
+                     lsr
+                     jsr   SetBG1XPos
+
                      jsr   DoFrame
                      rts
 
@@ -84,3 +86,4 @@ Demo
 FPSStr               str   'FPS'
 
 
+
diff --git a/src/App.Init.s b/src/App.Init.s
index dc51b72..ea48faf 100644
--- a/src/App.Init.s
+++ b/src/App.Init.s
@@ -51,10 +51,13 @@ MemInit        PushLong  #0                          ; space for result
                _Deref
                stx       BlitterDP
 
-; Allocate a bank of memory for BG1
+; Allocate banks of memory for BG1
                jsr       AllocOneBank2
                sta       BG1DataBank
 
+               jsr       AllocOneBank2
+               sta       BG1AltBank
+
 ; Allocate the 13 banks of memory we need and store in double-length array
 ]step          equ       0
                lup       13
@@ -200,5 +203,6 @@ ShutDown       rts
 
 
 
+
 
 
diff --git a/src/App.Main.s b/src/App.Main.s
index 64caf5b..4a503be 100644
--- a/src/App.Main.s
+++ b/src/App.Main.s
@@ -102,6 +102,9 @@ NO_INTERRUPTS        equ        0                    ; turn off for crossrunner
 
                      jsr        _InitBG1             ; Initialize the second background
 
+                     lda        #0
+                     jsr        _ClearBG1Buffer
+
 ; Load a picture and copy it into Bank $E1.  Then turn on the screen.
 
                      jsr        AllocOneBank         ; Alloc 64KB for Load/Unpack
@@ -303,7 +306,7 @@ DoTiles
 :rowloop
                      lda        #0
                      sta        :column,s
-                     lda        #$0015
+                     lda        #$0010
                      sta        :tile,s
 
 :colloop
@@ -314,9 +317,9 @@ DoTiles
                      lda        :tile,s
                      jsr        CopyTile
 
-                     lda        :tile,s
-                     eor        #$0003
-                     sta        :tile,s
+;                     lda        :tile,s
+;                     eor        #$0003
+;                     sta        :tile,s
 
                      lda        :column,s
                      inc
@@ -344,12 +347,34 @@ DoFrame
 
 ; Load a binary file in the BG1 buffer
 DoLoadBG1
-                     lda        BG1DataBank
-                     xba
-                     and        #$FF00
-                     ora        #$0001               ; Load directly into the BG1 buffer bank on Page 1
+                     lda        BankLoad
                      ldx        #BG1DataFile
                      jsr        LoadFile
+
+                     lda        BankLoad
+                     xba
+                     pha
+                     and        #$00FF
+                     tax
+                     pla
+                     and        #$FF00
+                     ldy        BG1DataBank
+                     jsr        CopyBinToBG1
+
+                     lda        BankLoad
+                     ldx        #BG1AltDataFile
+                     jsr        LoadFile
+
+                     lda        BankLoad
+                     xba
+                     pha
+                     and        #$00FF
+                     tax
+                     pla
+                     and        #$FF00
+                     ldy        BG1AltBank
+                     jsr        CopyBinToBG1
+
                      rts
 
 ; Load a simple picture format onto the SHR screen
@@ -448,6 +473,56 @@ CopyPicToField
 
                      rts
 
+; Copy a binary image data file into BG1.  Assumes the file is the correct size.
+;
+; A=low word of picture address
+; X=high word of pixture address
+; Y=high word of BG1 bank
+
+CopyBinToBG1
+:srcptr              equ        tmp0
+:line_cnt            equ        tmp2
+:dstptr              equ        tmp3
+:col_cnt             equ        tmp5
+
+                     sta        :srcptr
+                     stx        :srcptr+2
+                     sty        :dstptr+2            ; Everything goes into this bank
+
+                     stz        :line_cnt
+:rloop
+                     lda        :line_cnt            ; get the pointer to the code field line
+                     asl
+                     tax
+
+                     lda        BG1YTable,x
+                     sta        :dstptr
+
+                     ldy        #0                   ; move forward in the image data and image data
+:cloop
+                     lda        [:srcptr],y
+                     sta        [:dstptr],y
+
+                     iny
+                     iny
+
+                     cpy        #164
+                     bcc        :cloop
+
+                     lda        [:srcptr]            ; Duplicate the last byte in the extra space at the end of the line
+                     sta        [:dstptr],y
+
+                     lda        :srcptr
+                     clc
+                     adc        #164                 ; Each line is 328 pixels
+                     sta        :srcptr
+
+                     inc        :line_cnt
+                     lda        :line_cnt
+                     cmp        #208                 ; A total of 208 lines
+                     bcc        :rloop
+                     rts
+
 ****************************************
 * Fatal Error Handler                  *
 ****************************************
@@ -536,7 +611,8 @@ GrafInit
                      dw         $0fa9,$0ff0,$00e0,$04DF
                      dw         $0d00,$078f,$0ccc,$0FFF
 
-DefaultPalette       dw         $0ADF,$0FF8,$0CD6,$09CF,$0AC6,$08A5,$0FFF,$0694
+DefaultPalette       dw         $09BE,$0AA6,$0DC9,$0DB7,$09AA
+                     dw         $0080,$0f70,$0FFF
                      dw         $0fa9,$0ff0,$00e0,$04DF
                      dw         $0d00,$078f,$0ccc,$0FFF
 
@@ -735,7 +811,9 @@ msgLine3             str        ' -> Return to Try Again'
 msgLine4             str        ' -> Esc to Quit'
 
 ; Data storage
-BG1DataFile          strl       '1/bg1.bin'
+BG1DataFile          strl       '1/bg1a.bin'
+BG1AltDataFile       strl       '1/bg1b.bin'
+
 ImageName            strl       '1/test.pic'
 MasterId             ds         2
 UserId               ds         2
@@ -785,4 +863,23 @@ qtRec                adrl       $0000
 
 
 
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
 
diff --git a/src/Render.s b/src/Render.s
index 83e0df6..10d4e0c 100644
--- a/src/Render.s
+++ b/src/Render.s
@@ -67,6 +67,7 @@ Render
             jsr   _ApplyBG0XPos       ; Patch the PEA instructions with exit BRA opcode
             jsr   _ApplyBG0YPos       ; Set stack addresses for the virtual lines to the physical screen
             jsr   _ApplyBG1XPos       ; Adjust the direct page pointers to the BG1 bank
+            jsr   _ApplyBG1YPos
 
             ldx   #0                  ; Blit the full virtual buffer to the screen
             ldy   ScreenHeight
@@ -88,3 +89,4 @@ Render
 
 
 
+
diff --git a/src/blitter/BG1.s b/src/blitter/BG1.s
index 022fcf1..4c49872 100644
--- a/src/blitter/BG1.s
+++ b/src/blitter/BG1.s
@@ -4,6 +4,10 @@ _InitBG1
                         jsr   _ApplyBG1YPos
                         rts
 
+SetBG1XPos
+                        sta   BG1StartX
+                        rts
+
 ; Everytime either BG1 or BG0 X-position changes, we have to update the direct page values.  We 
 ; *could* do this by adjusting the since address offset, but we have to change up to 200 values
 ; when the vertical position changes, and only 41 when the horizontal value changes.  Plus
@@ -11,12 +15,21 @@ _InitBG1
 ;
 ; Note: This routine can be optimized as an unrolled loop of PEI instructions
 _ApplyBG1XPos
+                        lda   BG1StartX
+                        jsr   Mod164
+                        sta   BG1StartXMod164
+
                         lda   #162
                         sec
                         sbc   StartXMod164
                         bpl   *+6
                         clc
                         adc   #164
+                        clc
+                        adc   BG1StartXMod164
+                        cmp   #164
+                        bcc   *+5
+                        sbc   #164
                         tay
 
                         phd                           ; save the direct page because we are going to switch to the
@@ -39,6 +52,28 @@ _ApplyBG1XPos
                         pld
                         rts
 
+_ClearBG1Buffer
+                        phb
+                        pha
+                        sep   #$20
+                        lda   BG1DataBank
+                        pha
+                        plb
+                        rep   #$20
+
+                        pla
+                        ldx   #0
+:loop
+                        sta:  $0000,x
+                        inc
+                        inx
+                        inx
+                        cpx   #0
+                        bne   :loop
+
+                        plb
+                        rts
+
 ; Everytime either BG1 or BG0 Y-position changes, we have to update the Y-register
 ; value in all of the code fields (within the visible screen)
 _ApplyBG1YPos
@@ -47,7 +82,7 @@ _ApplyBG1YPos
 :draw_count             equ   tmp2
 :ytbl_idx               equ   tmp3
 
-                        stz   :rtbl_idx               ; Start copying from the first entry in the table
+                        stz   :ytbl_idx               ; Start copying from the first entry in the table
 
                         lda   StartY                  ; This is the base line of the virtual screen
                         sta   :virt_line              ; Keep track of it
@@ -194,6 +229,18 @@ CopyBG1YTableToBG1Addr
 
 
 
+
+
+
+
+
+
+
+
+
+
+
+
 
 
 
diff --git a/src/blitter/Blitter.s b/src/blitter/Blitter.s
index 30c83b2..ea7846b 100644
--- a/src/blitter/Blitter.s
+++ b/src/blitter/Blitter.s
@@ -54,7 +54,13 @@ _BltRange
 ; Now we need to set up the Bank, Stack Pointer and Direct Page registers for calling into 
 ; the code field
 
-               lda   BG1DataBank    ; Set the data bank for BG1 data
+               lda   StartX
+               bit   #$01
+               beq   :primary
+               lda   BG1AltBank
+               bra   :alt
+:primary       lda   BG1DataBank
+:alt
                pha
                plb
                rep   #$20
@@ -84,3 +90,4 @@ stk_save       lda   #0000          ; load the stack
 
                plb                  ; restore the bank
                rts
+
diff --git a/src/blitter/DirectPage.s b/src/blitter/DirectPage.s
index ac331a3..b4bdc82 100644
--- a/src/blitter/DirectPage.s
+++ b/src/blitter/DirectPage.s
@@ -15,13 +15,18 @@ EngineMode        equ   20          ; Defined the mode/capabilities that are ena
 DirtyBits         equ   22          ; Identify values that have changed between frames
 
 BG1DataBank       equ   24          ; Data bank that holds BG1 layer data
-BlitterDP         equ   26          ; Direct page address the holder blitter data
+BG1AltBank        equ   26          ; Alternate BG1 bank
 
-OldStartX         equ   28
-OldStartY         equ   30
+BlitterDP         equ   28          ; Direct page address the holder blitter data
 
-LastPatchOffset   equ   32          ; Offset into code field that was patched with BRA instructions
-StartXMod164      equ   34
+OldStartX         equ   30
+OldStartY         equ   32
+
+LastPatchOffset   equ   34          ; Offset into code field that was patched with BRA instructions
+StartXMod164      equ   36
+
+BG1StartX         equ   38          ; Logical offset of the second background
+BG1StartXMod164   equ   40
 
 bstk              equ   208         ; 16-byte stack to push bank addresses
 
@@ -59,3 +64,6 @@ DIRTY_BIT_BG1_Y   equ   $0008
 
 
 
+
+
+
diff --git a/src/blitter/Tiles.s b/src/blitter/Tiles.s
index c4e9783..a4d5afe 100644
--- a/src/blitter/Tiles.s
+++ b/src/blitter/Tiles.s
@@ -16,41 +16,42 @@
 ; X = Tile column (0 - 40)
 ; Y = Tile row (0 - 25)
 CopyTile
-                phb                     ; save the current bank
-                pha                     ; save the tile ID
+               phb                     ; save the current bank
+               phx                     ; save the original x-value
+               pha                     ; save the tile ID
 
-                tya                     ; lookup the address of the virtual line (y * 8)
-                asl
-                asl
-                asl
-                asl
-                tay
+               tya                     ; lookup the address of the virtual line (y * 8)
+               asl
+               asl
+               asl
+               asl
+               tay
 
-                sep   #$20              ; set the bank register
-                lda   BTableHigh,y
-                pha                     ; save for a few instruction
-                rep   #$20
+               sep   #$20              ; set the bank register
+               lda   BTableHigh,y
+               pha                     ; save for a few instruction
+               rep   #$20
 
-                phx                     ; Reverse the tile index since x = 0 is at the end
-                lda   #40
-                sec
-                sbc   1,s
-                plx
+               phx                     ; Reverse the tile index since x = 0 is at the end
+               lda   #40
+               sec
+               sbc   1,s
+               plx
 
-                asl                     ; there are two columns per tile, so multiple by 4
-                asl                     ; asl will clear the carry bit
-                tax
-                lda   Col2CodeOffset,x
-                adc   BTableLow,y
-                tay
-                iny                     ; +1 to move past to opcode to the operand
+               asl                     ; there are two columns per tile, so multiple by 4
+               asl                     ; asl will clear the carry bit
+               tax
+               lda   Col2CodeOffset,x
+               adc   BTableLow,y
+               tay
 
-                plb                     ; set the bank
-                pla                     ; pop the tile ID
-                jsr   _CopyTile
+               plb                     ; set the bank
+               pla                     ; pop the tile ID
+               jsr   :ClearTile        ; :_CopyTile
 
-                plb                     ; restore the data bank and return
-                rts
+               plx                     ; pop the x-register
+               plb                     ; restore the data bank and return
+               rts
 
 ; _CopyTile
 ;
@@ -60,90 +61,130 @@ CopyTile
 ; A = Tile ID (0 - 1023)
 ; Y = Base Adddress in the code field
 
-_CopyTile       cmp   #$0010
-                bcc   :FillWord
-                cmp   #$0400
-                bcc   :CopyTileMem
-                rts                     ; Tile number is too large
-
-:TilePatterns   dw    $0000,$1111,$2222,$3333
-                dw    $4444,$5555,$6666,$7777
-                dw    $8888,$9999,$AAAA,$BBBB
-                dw    $CCCC,$DDDD,$EEEE,$FFFF
-
-:FillWord       asl
-                tax
-                ldal  :TilePatterns,x
-
-CopyTileConst   sta:  $0000,y
-                sta:  $0003,y
-                sta   $1000,y
-                sta   $1003,y
-                sta   $2000,y
-                sta   $2003,y
-                sta   $3000,y
-                sta   $3003,y
-                sta   $4000,y
-                sta   $4003,y
-                sta   $5000,y
-                sta   $5003,y
-                sta   $6000,y
-                sta   $6003,y
-                sta   $7000,y
-                sta   $7003,y
-                rts
-
-:CopyTileMem    sec
-                sbc   #$0010
-
-                asl
-                asl
-                asl
-                asl
-                asl
-                tax
-
-CopyTileLinear  ldal  tiledata+0,x      ; The low word goes in the *next* instruction
-                sta:  $0003,y
-                ldal  tiledata+2,x
-                sta:  $0000,y
-                ldal  tiledata+4,x
-                sta   $1003,y
-                ldal  tiledata+6,x
-                sta   $1000,y
-                ldal  tiledata+8,x
-                sta   $2003,y
-                ldal  tiledata+10,x
-                sta   $2000,y
-                ldal  tiledata+12,x
-                sta   $3003,y
-                ldal  tiledata+14,x
-                sta   $3000,y
-                ldal  tiledata+16,x
-                sta   $4003,y
-                ldal  tiledata+18,x
-                sta   $4000,y
-                ldal  tiledata+20,x
-                sta   $5003,y
-                ldal  tiledata+22,x
-                sta   $5000,y
-                ldal  tiledata+24,x
-                sta   $6003,y
-                ldal  tiledata+26,x
-                sta   $6000,y
-                ldal  tiledata+28,x
-                sta   $7003,y
-                ldal  tiledata+30,x
-                sta   $7000,y
-                rts
-
-
+:_CopyTile     cmp   #$0010
+               bcs   *+5
+               brl   :FillWord
+               cmp   #$0400
+               bcs   *+5
+               brl   :CopyTileMem
+               rts                     ; Tile number is too large
 
+:TilePatterns  dw    $0000,$1111,$2222,$3333
+               dw    $4444,$5555,$6666,$7777
+               dw    $8888,$9999,$AAAA,$BBBB
+               dw    $CCCC,$DDDD,$EEEE,$FFFF
 
+:ClearTile     sep   #$20
+               lda   #$B1
+               sta:  $0000,y
+               sta:  $0003,y
+               sta   $1000,y
+               sta   $1003,y
+               sta   $2000,y
+               sta   $2003,y
+               sta   $3000,y
+               sta   $3003,y
+               sta   $4000,y
+               sta   $4003,y
+               sta   $5000,y
+               sta   $5003,y
+               sta   $6000,y
+               sta   $6003,y
+               sta   $7000,y
+               sta   $7003,y
+               rep   #$20
 
+               lda   3,s
+               asl
+               asl
+               and   #$00FF
+               ora   #$4800
+               sta:  $0004,y
+               sta   $1004,y
+               sta   $2004,y
+               sta   $3004,y
+               sta   $4004,y
+               sta   $5004,y
+               sta   $6004,y
+               sta   $7004,y
+               inc
+               inc
+               sta:  $0001,y
+               sta   $1001,y
+               sta   $2001,y
+               sta   $3001,y
+               sta   $4001,y
+               sta   $5001,y
+               sta   $6001,y
+               sta   $7001,y
+               rts
 
 
+:FillWord      asl
+               tax
+               ldal  :TilePatterns,x
 
+               sta:  $0001,y
+               sta:  $0004,y
+               sta   $1001,y
+               sta   $1004,y
+               sta   $2001,y
+               sta   $2004,y
+               sta   $3001,y
+               sta   $3004,y
+               sta   $4001,y
+               sta   $4004,y
+               sta   $5001,y
+               sta   $5004,y
+               sta   $6001,y
+               sta   $6004,y
+               sta   $7001,y
+               sta   $7004,y
+               rts
+
+:CopyTileMem   sec
+               sbc   #$0010
+
+               asl
+               asl
+               asl
+               asl
+               asl
+               tax
+
+               ldal  tiledata+0,x      ; The low word goes in the *next* instruction
+               sta:  $0004,y
+               ldal  tiledata+2,x
+               sta:  $0001,y
+               ldal  tiledata+4,x
+               sta   $1004,y
+               ldal  tiledata+6,x
+               sta   $1001,y
+               ldal  tiledata+8,x
+               sta   $2004,y
+               ldal  tiledata+10,x
+               sta   $2001,y
+               ldal  tiledata+12,x
+               sta   $3004,y
+               ldal  tiledata+14,x
+               sta   $3001,y
+               ldal  tiledata+16,x
+               sta   $4004,y
+               ldal  tiledata+18,x
+               sta   $4001,y
+               ldal  tiledata+20,x
+               sta   $5004,y
+               ldal  tiledata+22,x
+               sta   $5001,y
+               ldal  tiledata+24,x
+               sta   $6004,y
+               ldal  tiledata+26,x
+               sta   $6001,y
+               ldal  tiledata+28,x
+               sta   $7004,y
+               ldal  tiledata+30,x
+               sta   $7001,y
+               rts
 
 
 
diff --git a/tools/pngtoiigs.js b/tools/pngtoiigs.js
index 6913c62..9898b10 100644
--- a/tools/pngtoiigs.js
+++ b/tools/pngtoiigs.js
@@ -29,13 +29,18 @@ function pngToIIgsBuff(png) {
         for (let x = 0; x < png.width; x += 1, i += 4) {
             const pixel = png.data.slice(i, i + 4);
             const index = findColorIndex(png, pixel);
-            const j = i / 8;
+            const j = y * (png.width / 2) + Math.floor(x / 2);
+
+            if (index > 15) {
+                console.warn('Pixel index greater than 15. Skipping...');
+                continue;
+            }
 
             if (x % 2 === 0) {
-                buff[j] = buff[j] + (16 * index);
+                buff[j] = 16 * index;
             }
             else {
-                buff[j] = buff[j] + index
+                buff[j] = buff[j] | index;
             }
         }
     }
@@ -43,6 +48,16 @@ function pngToIIgsBuff(png) {
     return buff;
 }
 
+function shiftImage(src) {
+    const { width, height, colorType, bitDepth } = src;
+    const dst = new PNG({ width, height, colorType, bitDepth });
+
+    PNG.bitblt(src, dst, 1, 0, width - 1, height, 0, 0);
+    PNG.bitblt(src, dst, 0, 0, 1, height, width - 1, 0);
+
+    return dst;
+}
+
 function pngToIIgsBuffRepeat(png) {
     let i = 0;
     const buff = Buffer.alloc(png.height * png.width, 0);